Lesson: Chapter 5 — Optics
This erases every answer in this set and starts you again at question one. Your score will be gone.
Type these four numbers to confirm:
Those numbers don't match. Look at them again and type them.
In Activity 5.1 the image of a distant scene forms 20 cm from a concave mirror. The focal length is about…
The right answer is the one marked above.
20 cm. Rays from a distant object are nearly parallel, so they meet at the focus.
40 cm would be the radius of curvature, not the focal length.
This browser is not saving your answers, so no total can be shown.
Answer the question to continue.